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(No Model.) 9 Sheets-Sheet 1. G. A. PAIRPIELD & G. E. WITHERELL.

METAL SCREW MACHINE.

No. 409,674. Patented Aug. 27, 1889.

W tiil l (No Model.) 9 Sheets-Sheet 3.

' GI A. PAIRPIELD & G. E. WITHERELL.

METAL SCREW MACHINE.

No. 409,674. Patented Aug. 27, 1889,

I //7vE/7far5.

(Nor/106181. 9 Sheets-Sheet 4.

G. A. FAIRPIELD -& G. E. WITHERELL. METAL SCREW MACHINE- No. 409,674. Patented Aug. 27, 1889.

(No Model.) 9 Sheets-Sheet 7.

G. A. PAIRFIELD & G. E. WITHERELL.

METAL SCREW MACHINE.

No. 409,674. Patented'Aug. 2'7, 1889.

14092 95525. Ava 5017711 gala/ma? 1 @wye W ,66.

(-No Model.) 9 Sheets-Sheet 8.

G. A. PAIRFIELD & G. E. WITHEBELL.

METAL SGREW MACHINE.

No. 409,674. Patented Aug. 27., 1889.

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6D em 9 S heetsSheet 9.

Patented Aug. 27, 1889.

III/' mllwm IL. IlIIllFll G. A. FAIRFIELD & G. E. WITHERELL.

(No Model.)

ad guw/fi "UNITED "STATES PATENT OFFICE. "1;.

GEORGE A. FAIRFIELD Ann GEQRGE WITHERELL, F HARTFORD, con- NEeTIcUT, AssIeJoRs ToTHE HARTFORD MACHINE SCREW COMPANY,

OF SAME PLACE.

M ETAL-SCREW MACHIN E.

SPECIFICATION forming ea of Letters Patent No. 409,674, dated August 27, 1889.

Appli at n file y 1, 1889- Serial No. 309,168. on an.)

To all whom) it iii/ 1y concern:

Be it known that we, GEORGE A; FAIRFIELD and GEORGE'E. \VITHERELL, both citizens of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Machines for Making Screws,-

of which the following is a specification.

-Our invention relates to improvements in machines for making screws; and the objects of our improvement are to render themachine automatic in its action,-and in general to improve the efliciency, especially with refercnceto its reliable action. v

Ifithe accompanying drawings, Figure l is a plan view of ourmachine. Fig. 2 is a front elevation'thereof. Fig. 3 isa side elevation, showing'the left-hand end of the machine. Fig. 4 is a central longitudinal sectiomipartly in elevation, on line scwof Fig. 1. Fig. 5 is a transverse section on the line. y y of Fig. 1.

V V Fig. 6 is a longitudinal section of detached parts on the line zof Fig. 1,some of the parts being shown in elevation and on a larger scale than the preceding figures. Fig. 7 isa transverse section of detached parts on the line 10 w of Fig. Llooking toward the right.

Fig. 8 is a transverse section of nearly all of the same parts, but inadifierent position, the plane of section being indicated by the line '1) '0, Fig. 4. Fig. 9 is a side elevation of the head-operatin g disk, showing the opposite side from that represented in Figs. 7 and 8. Fig. 10 shows the insidecdgcof the cam belonging to the disk, Fig. 9. Fig. 11 isa rear elevation of detached parts,illustrating the threadingdic slide and connected parts, the same being on a still larger scale than Figs. 6, 7, S, 9, and

'10. Fig. 12 is a detached transverse section of the parts shown in Fig. .11, on line it u of Fig. 13. Fig! 13 is a plan View of the same parts, a portion of the frame being shown in horizontal section. Fig. ll is a central longitudinal section of one of the spindles and holding-chuck, some of the parts being shown in elevation. Fig. 15 is a front elevation of detached parts, showing the stop mechanism and also the stationary cam for opening the chuck. Fig. 1(i is a side elevation of a portion of said stop mechanism, looking toward the or'frame of the machine; ,B B, main uprights of the head-block, and C the tail-block. The. main shaft D extends substantially from end to end of the machine and takes its hearings in the tail-block and uprights B B. Within} the cap or case E is a revolving head F, care,

the other end has a bearing in one of the uprights B, through which the shaft passes, so that said upright, directly and indirectly, furnishes abearing for both that end of the head and a portion of the shaft D. The shaft Dis provided with a geared wheel lihwhich meshes into a driving-pinion 20, (see Fig. 1,) which pinion is or maybe driven bya special speeding device 21, of a well-known construction,

and which forms no part of ourinventipn. We therefore consider it unnecessary to specifically describe said speeding mechanism,which may be omitted, if desired, and the machine driven by direct application of power in the ordinary manner; or any other speeding mechanism may be substituted forthat shown.

' rying four spindlesIS, one end of said head [taking its hearings upon the shaft D, while Gdesignates a cam-pulley; rigidly mounted on the shaft D, so as to revolve with it, and having upon its periphery the series of canis 22' and 23. and at one side thescries of cams 24 and 25.

Upon the front side'of the machine there is y a sliding hopper 26, having'an adjustable side 27, (see Fig. 13,) to adjust it for blanks of different lengths. This hopper is arranged to slide longitudinally in suitable ways, and carries a stud or friction-roller 28, (see Figs. 1 and 2,) which roller is acted upon bythe pcripheral cams 22 and 23 of the cam-pulley G to reciprocate said hopper at the proper times. The base of .the hopper 26 is also provided with a sliding plunger 29, (see Fig. 6,) the front end of which is provided with ascrewadjustable head 30, the eifect of which is to vary the length of -the plunger 29. 'This too ing ofspring-jaws 36, having wedge orcam shaped sides that fit the flaring mouth of theplunger 29 is mounted within the hollow slide without yielding, provided there is no unusual obstruction. A s rin 3:? havin one end socured to the base of the hopper 26 and its other end to the hollow slide 3l,'ha's atend eney to drawsaid plunger in one direction, and it 'isunovcd in the opposite direction by means of the inner series of side acting cams 24 of't'he cam-pulley G, saidcains acting upon the extension 33 of said hollow slide.- This hopper is so-set that the bottom blank within said hopper will be in substantial alignment with the front one of the spindles .18 of the revolving headduring their period of rest. 9

The frontend of the hopper is provided with a pointedcam'ii r, which acts, in connection with the eonfron ting edges of correspondin gly-shaped cams 35, on the several spindles 18. For convenience of construction, the cams 35 are formedon a ring and are secured to the spindles by a slot-and-screw connection, as shown i-1 r-'Fi-gs.'1',-2', and 4, whereby they may be adjusted relatively to .the square of the holding-chuck. Each spindle is hollow and provided with a holding-chuck consistliollon-"s'l'jindlc, as in ordinary,sp1'ing-jaws. These jaws are secured within the sliding sleeve 37, Fig. 14,, the rear end of which is provided with lugs 38, that rest'in longitudi nal slots 39 at the rear end of saidspindles,

whereby the jaws are prevented from turning within the spindles and wherebyshoulders are formed for the engagement. of the angle,

These an le-levers 40 are )ivoted a n u I is rigidly secured to levers 40. within a sleeve (1; that the spindles;

Surrounding the slotted part of the spindle 18 there. is a slidin cone 12 for en. ement with the'longest member of said 'angledever. This cone is secured to a sliding carriage. 43, that slides in ways formed upon lugs H, attached to the revolving'head F, said carriage being provided with a roller 45 and stud 46 for being acted upon by the stationary cam 47, Figs. 1, 3,. and 15, and the slide 48,'which slide is pushed. toward the head by means of the series of cams 4!) upon the side of the cam-wheel II at one end of the shaft D and returned by aspring (Not shown.)

Yithin the sleeve 37 inthe axis of each spindle is a sliding knockout-rod 50, which is continually prcssedupon in an ontwarddirection by means of the spring 51., Fig. 14. This knockout-rod should be provided with v a spline or other suitable device to make it revolve withthe spindle, and is provided at its rear end with a cam 52 for engagement at times with either .of the stop-levers 53 or 54.

' of; said lever is connected by means of a pitman 55 with the rocking arm 56 of the rockshaft- 57, the stop-lever 53 being rigidly connected tothe other end of said rock-shaft 57. The rock-shaft 57 is also provided with a rocking arm 5S, having a shoulder at its outer end that engages the latch-lever 59, said latcl1-le- Yer and bearin s of the rook-shaft being 111011111 ed upon suitable lugs that are-rigidly secured to the cap or case E.

The pivoted latch-lever 59 is proyide'd with va cord or wire 60- for connection with any spring or weight actuated shipper for stepping the machine.

The revolvinghead F is given an intermit tent rotaryI motion by means of. the head-opera ting disk (51. and its'connections.

The gear-wheel 19 meshes into a'pinion 62 on the shaft 63, to one end of which shaft is the crank-pin disk 64, carrying the crank-pin (i5,

to which one end of thepitman 66 is connected, the other end being connected with the crosshead 67, that.slides'backward and forward on the ways 68, Figs. 7 and 8. Another pitman 69 connects this cross-head with the headoperating disk 61, whereby said disk is recip- 'rocated to the extent of one-quarter of a revolution for each revolution of the crank-pin spring 71. See Fig. 81) This head-operating disk is held against longitudinal movement upon the shaft D, and is free to oscillate independentlyofthe shaft. By the side of said head-operating disk is the locking-disk 72,

which is rigidlysecured to theiiub of the revolving head F,v so as rotate: therewith. That side of this disk which faces the headoperating disk 61'. is provided with an internal ratchet 73, having four teeth at equal distances apart. annular groove in said head-operating disk, so as to be engaged by the pawl 70. The locking-disk 72 is also provided with-four pe-. ripheral notches 7 i, which are engaged by the locking-bolt 75.- This locking-bolt is pressed upwardly into the notches 74: by means of the spring 77, Fig. 7. It is also provided with a laterally-projecting pin 7 (i. V Pivoted to the edge of the head-operating disk 61, and in its normal position lying'up'on the periphery of said dis-k, isthe cam 78. This cam is held againstthe'pcriphery cf the disk 61 by means of a spring'i'il', (shown most clearly in Fig. 9,)one end of which is secured This ratchet sets nto the cn'dot which bears upon the latcrallyprojeet-- ing pin 80 at the outerend of said cam. This position for again withdrawing theiockingbolt. l

Each of the respective spindles is provided with'a friction driving-whec-L 82,-1-n'eferably having a leather face.

Mounted upon the top of the case or cap E is a sliaft'83, bearing a'dri\'ing-pulley S4, for

receiving power from a suitable-belt, and a friction driving-pulley 85, for acting upon the respective friction-wheels 82 as they are intermittentlybroughtunderneath said 'puiley, where they remain while thehead is. at rest, so that a revolving motion is imparted to the respective spindles at that time. In like-inanner motion is communicated to-the spindles as they. stop at t-he rear of the machine by means of .the shaft- 8.6 and its friction driving pulley 87. This shaft is driven by means of belts passing over the set of pulleys 88, the

middle one of which is-fast to the shaft 86 and the other two are lo'ose. (inc of the belts running upon said pulleys is a cross-beltand the other is straight. These belts (not shown) will be run through guides inthe shipper 89, one end of which shipper is connected with the rocking arm 90. This rocking arm is rigidly connected with airock-shaft 91., l ig.'.3,.to the opposi t'e end of which is another rocking arm 92, whose end engages the cams 03 or. the cam-wheel II, whereby the shipper is reciprocated to throw. its respective beltsfroni'one -of the"loose",.pulleys to'the fast pulley for embly acting ju'pona chan ing'the direction of the revolution of the shaft 86-, in thc well-known manncrof shipping such belts for reversing motion in v other machines A 7 At the 'top of the tail-block 6 there is a s1ide"9.4,'fitted-by'ineans of a s1 line )5 or. equivalent-deviee-to prevent it" from rotat ing, and provided atits'front end with a chuck 9d, forholding any-desired tool 'as,.for in: stance, the roughing-borer turniiig-toolmr This slide ispulled in one direction by means of the spring 98, lgTig- 4, to withdraw itiiroin its work, and is-jforccd in the opposite direction up to itswork by means of the series of cam; 25 olrtho cam'pu ll ey. G,'said cams pr'cfl frietionqoller 99 on the end of said-slide. v a

At the rear side of the tail-block Gis .the'i threading-die slide 100, bearing at'its front end a 'chuck j 101, for holding the threading die 102, This slidois prevented from rota-- tion when cutting a-thread by means of the laterally-projecting pin" 103,]. igs. 12 and 13,

which bears. upon an adjustable ledge I04,

- that is stationarily fastened by set-screws 105 at the rear of the tail-block,and. by means of which screws said ledge maybe adjusted longitndinally. with a hinged pieeo106, that is pivoted there-.

The end of this ledge is'provide'd' to by means of a stop-joint, (see Fig. 11,) so thatit may swing downwardly with its ripper Surface-into alignment with that of the rest of theledgebut no farther, while it is free to swing upwardly under the influence of the springld'i. The slideis prevented from rotation in the opposite direction by means-of the longitudinal shoulder 108 on said slide and the spring-pressed pawl 109. It ispulled back' away from its work by means of a weighted cord 110, which extends over a pulley 111, mounted upon a iixed stud. At the opposite end of said slide 100 there is a sliding socket 112, that slides in suitable ways on an extension of the tail-block, and within which an attachable and detachable follower 113, of any desired length, may be placed in aligninent with the slide 100. This follower is fully shown in Figs. 11 and 13, and partially shown. in Fig.1. The series of cams 24 onthe campulley G act upon this follower to force the. slide 100 up to its work.

The spring 51 is intended to operate the knockout to discharge the work from the jaws as soon as the jaws are. opened; but if for any reason the spring fails towel-k we provide the-stationary cam 114 FigsJ and 3, on one of the uprights 1 which will be .engagedby the end of the-hnockout-rod and positively move the. rod "longitudinally in a direction to knock out the work. Inlike man ner, if for any reason the sliding carriage that opens and bloses the jawsshall not be in a position totally open said jaws'when it arrives at the vfrontside of the machine, we

provide the stationary cam 1l5,-=fixc'd to the cantor. case E in'the 'path of the'frictionroller 45, which engaging said 'caln will fully 7 open the jaws 'prcparatory'to, receiving 'the work. g

The-series of from-each other, and the hopper 'andslidcs l i-and 100 .arc arranged at like distances apart-and respectively in alignment with the threeupper spindlesklnring each period of rest between the intermittent inovenienis oi the revolving head. r

1 As illustratedtho-machine specially hammers,- milhng or roughing and. threadingbolt-blanks which are. square in crossseetion .and whose'end-s have previously been dressed tothe proper form. Four of these blanks are illustrated. within the hopper in Fig. 6," and another blank is illustrated. in the chuck-jaws in Fig. 14. "The blanks arc placed in the hopper with that portion of the square which is to'fo'rm the bolt-lmnd toward the revolving head,and the chuck-jnws are provided with faces adapted to grasp that end of said-square blanks. The length of the spindle-s are concentrically mounted within the head atequal distances H5 blanks will a course vary with the variation in the-bolts'that may be desired. The spindie in the intermittently-rotating head imme diately in-fro'nt of the hopper has. its, jaws opened ready to receive a blank, the movement of the head being so timed with refer-- ence to the hopper mechanism that when the headis at rest and the shaft D is revolving the peripheral cams 22' of the cam-pulley G on shaft D (which is continually rotating) force the hopper toward the head. The cam 3 1- at the front end of the hopper, entering between the confronting edges of the cams 35 on the spindles, will bring said spindles into a position to have the square'of the ehuck jaws coincide with the square of the blanks within the hopper, The cam is so shaped as to let the hopper remain at rest for a while in this position, during which period of rest one of the earns 24 on the cam-wheel G acts upon the extension 33 of the plunger 29 to force the bottom blank within the hop er forward with its head end within the chue -jaws, the end of said blank striking the end of the knockout-rod and forcing it backwardly against its spring. The cams 49 on the cam-wheel ll then force the slide 48 against the stud 46 to move the carriage -13, thereby forcing the cone '42 between the long ends of the angle-levers 40, which levers draw the sleeve 37 and jaws 30 into the spindle to firmly force the jaws upon said a blank, as illustrated in Fig. 1-1. 'Ifthe blank mectswith any obstruction while forcing it from the hopper, the spring 118 permits the plunger to yield and prevents a breakage of the machine. The spring 32 returns the plunger 29 toits normal position and the peripheralcamsflil ,on the cam-pulley G withdraw the hopper from the blank. After the hopper and blank within the jaws are disengagedihe head-operating disk 61 will be carried by the crank-pin-disk (34 and connected parts into the position illustrated in Fig. 8,

with the beveled end of the cam to one side'of the pin 7 6 of the locking-bolt 75. The headating disk 61 carries its cam 'underthe pin 76, said pin rides over the outer edge of said cam until it runs ofi. the end of 'the, rabbeted portion 81, when it and the locking-bolt '75 are free'to'be'forccd into the next notch 74:

of the lockingalisk under the in'flue'nce of the spring 77. -\Vh'en the head-operatingdisk 61 makes its return motion, the pin 7b remains in its normal position and passes through or under the rabbeted portion 81,the cam swinging outwardly on its pivot until its end passes the pin 76, after which the spring 79 Willbring the cam 78 against the periphcry of the disk, ready to have its beveled end again withdraw the locking-bolt, in the manner before described. During the period of rest. one of the side cams 25 on the camwheel G acts upon the slide 9i to press it forward, when the milling-tool or roughing-box turns down or mills the body of the 'blank into its round form for'any desired length. The spindle in alignment with. said slide is at this time being driven by having its friction-wheel' 82 in contact with the friction-pulley 85 at the top of the case E. The spring 98 withdraws the slide after it has done its work, and the revolving head makes another quarter-revolution, in the manner before described, bringing the rounded bolt-blank into alignment with the threading die slide 100. One of the cams 24, acting upon ..the follower 1-13, presses the slide forward against the bolt in'said spindle. The shipping mechanism of the shaft 86 has been acted upon by the cams 93 of the cam-wheel II to carry the driving-belts on the pulleys 88 into the position for driving the spindle in a proper direction to cut the thread. For longer or shorterbolts folhas'becn started upon the blank it will draw the spindle. along, while the pin 103, resting upon the adjustable ledge 104, holds the die and slide from revolving. Then the pin strikes the jointed portion, said portion turns down to a horizontal position and is stopped by its stop joint or hinge,'and-thepin travels over it the same as if it were all in one piece until the pin slips off the end of the'ledge, leaving the slide 100 free to revolve withthe spindle until the shipping mechanism reverses its motion. When the pin slips off the ledge, the spring 107? throws the hinged piece '106 up'out of the way, so that the pin does not come in cont-actwi'th it. By adjusting the ledge 10. longitudinally with "reference to the slide 100, so that the pin will slip oif at a particular point, the threading-dies may be madeto travel on the body 'of the bolt for threading it up to a given distance from its head. The cams 93 on'the earn-pulley ll operate the shipper to reverse the'motion of the spindle and unscrew the threading-die from the bolt, the slide 100 then being prevented from rotating by means ofthe springpressed pawl 109 engaging the slot or-shoulder 108.. As soon'as the tln-eading-die-is unscrewed from-the bolt, the weighted cord ll0 ireturns the slide 100 and follower 113 totheir normal position, ready for; threading anotherbolt. At the next intermjttent movementof the revolving head the roller 45 on the carriage 43 engages the stationary 09.111 47 and moves ,said carriage in a direction to w-itlidrhwthe cone 42 from beti'veen the angle-levers 40, thereby releasing the sleeve 37 and permittln g lowers of different lengths may be substituted for the follower 113. After the threading-die the spring-jaws to open, so that the spring 52 will move the knockout in a direction to force the bolt from the jaws. 'If, however;

for any reason the jaws are not freed from the bolt, the end of theknockout will engage the stationary cam 111 and force the knockout in a direction to tree the jaws. When the respective spindles are stopped during their intermittent motion at the lower part of the machine,'they remain idle. Wehave followed one spindle around with the head; but it will of course beunderstood that the several spindles are operating at the same ti 1ne-that is to say, during each period of rest one spindle is supplied with the blanks from the hopper, another spindle and connected parts are turning or roughing the body of the blank, and the body of the blank in the other spindle is being threaded. If for any reason the blank is not properly seated in the jaws when theystop in front of the hopper, and the plnnger-rod-is not pushed outwardly by the blank,-th en the cam '52 on the end of said rodwill be coincident-with the position of the stop-lever 53, so that as soon as the spindle arrives at the top of the machine and begins to revolve said cam will hitthe stop-lever 53 and move the rocking shaft 57 and rocking arm 58, thereby releasing the latch-lever 5!), so that it is free to rise Y up and release the shipping-cord 60. This cord is intended to run to any convenient point where there is a shipper ,or a clutch mechanism for stopping or releasing the shaft that drives the machine, which shipper or clutch mechanism may be actuated by a weight, a cam, or spring to throw the parts into position to stop the driving-shaft, while the cord and latch 59 are designed tohold said shipping or clutch mechanism in positionto drive the machine. In like manner the stop-lever 54. will be acted upon through the pitman 55 to release the same latch-lever and cord 59 and 60,- if for any reason the knockout-rod is not in its proper position when the spindle arrives at the rear side of the machine. When a bolt or blank is properly seated within the jaws, the-cam 52is pushed out far enough to pass by the stop-levers without coming in contact therewith.

We claim as our invention- 1. The combination of an intermittentlyrevolving head, a series of spindles mounted therein and provided with holding-jaws and series of cams 35, thehopper 26, and the sliding cam 34, acting upon confronting edges of the cams 35, substantially as described, and for the purpose specified.

2. The combination of anintermittentlyrevolving head, a series of spindles mounted therein and provided with holding-jaws, the hopper 26, sliding cam 34, and the cams 35,.in

' the form of a ring, circumferentially adjustable on the spindles, substantially as described, and for the purpose specified. I 3. The combination of the intermittentlyrevolving head, a series of spindles mounted therein, the hopper 26, its plunger 29, the hollow slide 31, for receiving the shank of the plunger, the spring 119, and mechanism for reciprocating said hollow slide and plunger, substantially as described, and for the purpose specified.

4. The combination of the hopper 26, the plunger 20, the screw-adjustable h'ead'BO at the end of said plunger, and. mechanism for reciprocating said plunger and head, substantially as described, and for the purpose specified.

5. The combination of a revolving head, the head-operating disk 61, mechanism for oscillating said disk a given .fractional part of a revolution, the pawl 70, mounted on said disk, the locking-disk 72, provided with a ratchet for engagement with said pawl and locking-recesses 74, a locking-bolt 75, provided with pin 76, and the hinged cam 78, hinged to said head-operating disk and acting to withdraw said locking-bolt,.substancesses and a ratchet, the head-operating disk 61, the pawl 70, mounted thereon, the cam 78, provided with a rabbet 81, the spring 79, for pressing said cam against the disk 61, and mechanism for oscillating said disk, substantially as described, and for the purpose specified.

8. In a'machine for threading serews, the combination of the threading-slide 100,1nechanism for forcing said slide to its work, the laterally-projecting pin 103, and the adjustable ledge 104, for being engaged by said pin,

substantially as described, and for the purpose specified.

9. In a machine for threading screws, the combination of the threading-slide 100, mechanism for forcing said slide to its work, the laterally-projecting pin 103, the adjustable ledge 104, for being engaged by said pin, the pivoted piece 106, provided with a stop-joint at the end of said ledge, and the" spring 107, substantially as described, and for the purpose specified.

10. In a machine for threading screws,the combination of the threading-slide 100, mech-. anism for forcing said slide to its 'work, the laterallyprojecting pin 103, mounted on said slide, the adjustable ledge 104, the longitudinal, shoulder 108, and the spring-pressed pawl 109, for engaging said shoulder, substantially as described, and for the purpose specified.

' ranged to slide in alignment with said slide,'

11. In a machine for threading screws, the combination of the threading-slide 100, the

attachable and detachable follower 113, ur-

and the cams 21, for pressing upon said follower, substantially as. described, and for the purpose specified.

12.. The combination of an intermittentlyrevolving head, a series of spindles mounted therein, the hopper 26, plunger 29, tool-bearing slides 94: and 100, mechanism for driving the spindles when in alignment with said slides, the central shaft D, and the cam-pulleyr G, substantially as described, and for the purpose specified.

13'. The combination of the intermittentlyrevolving head, aseries of spindles mount-ed therein and provided with friction driving- ,wheels, the driving-shaft 83, having friction driving-pulley 85, acting upon said wheels at one point for driving them continuously in one direction, .the driving-shaft 80, having friction driving-pulley S7 at another point, andshipping mechanism for changing the motion of said driving-shaft S6 to drive the spindles first in one direction and then reversing their motion, substantially as described, andfor the purpose specified.

l t. The combination of an intermittentlyrevolving head, a series of hollow s indles mountedl'threin', the sleeves 37, aving spring-jaws 36 and lugs 38, the angle-levers 40, engaging said lugs, the cones l2, and operating mechanism, substantially as described,

40, engaging said lugs, the cones 42, the sliding carriages 43, carrying said cones, the rollers and projections 45 and 4 6, and stationary cams 4.7 and 115, located in the path of said rollers 45 at the discharging and receiving points of said spring-jaws, substantially as described, and for the purpose specified.

17. The combination of the intermittently revolving head, a series of spindles mounted therein, the knockout-rods 50, springs 51, cams 52 on the ends of said knockout-rods, and a stop lever 01'' levers located with reference to the path of said cams, substantially as described, and for the purpose specified.

. 18. The combination-of the intermittentlyrevolving head, aseries of spindles mounted therein, the knockout-rods 50, springs 51, for forcing said rods in the direction to free said jaws, and the stationary cam 1,151, located with reference to the path of the ends of said knockout-rods, snbstantiall y as described, andfor the purpose specified.

19. The'combination of the intermittcutlyrevolving head, a series of spindles mounted therein, mechanism at one point in the revolution of said head for driving the spindles first in one direction and then ill-another, the threading-slide 100, having a projection or pin 103, and an adjustable ledge for holding said slide against rotation up to a given point, substantially as described, and for thepurpose specified.

20. The combination of the shaft 86, set of pulleys 88,-shipper 89, cams 9-) on the camcams and shipper, substantially as described, and for the purpose specified.

21. The combination of the intermittentlyrevolving head, the shaft 1.), concentric therewith, the slides 96 and 100, cam-pulley G, head-operating disk 61, gear-wheel 19, and mechanism for operatively connecting said gear-wheel and l're'ad-operating dislgsubs tanpulley H, and mechanism connecting said I tially as described,and. for the purpose spoci- 22. The combination of the intermittently revolving head, a series of spindles mounted therein, the shaft D, the slides 06 ,and .100, cam-pulley G, head-operating disk 6], gearwheel 19, mechanism for operatively connecting said gear-wheel and head-operating disk, the shaft 86, having the set of pulleys 89, shipper 89, cams 93 on cam-pulley II of the: shaft D, and connectingmechanism between said shipper and cams, substantially as described, and for the purpose specified.

23. The combination of the intermittentlyrevolving head, a series of spindles mounted therein and provided with holding-jaws, the sliding carriages mounted on ways secured to said head at the ends of said spindles, mechanism actuated by the longitudinal movement of said carriages for operating said holding-jaws, the projections and rollers 45 and 46, stationary cam 47, and the cams 49 on the wheel ll, operatively connected with the project-ions 46', substantially as described, and

for the purpose specified.

GEO. A. FAIRFIELI').

GEO. E. WITHERELL- Witnesses:

S. H. CUnrIss, DANIEL S. MORRELL. 

